package cn.tedu;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Scanner;

/**
 * @author Administrator
 */
public class Demo11 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入用户名:");
        String username = scanner.nextLine();
        System.out.println("请输入密码:");
        String password = scanner.nextLine();
        try (
                Connection conn = DBUtils.getConn();
        ) {
            String sql = "select password from user where username=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1,username);
            // 执行查询
            ResultSet rs = ps.executeQuery();
            // 判断是否有数据
            if (rs.next()) {
                // 得到查询到的密码
                String pw = rs.getString(1);
                // 拿用户输入的密码和查询到的密码比较
                if (pw.equals(password)) {
                    System.out.println("登录成功!");
                } else {
                    System.out.println("密码错误!");
                }
            } else {
                System.out.println("用户名不存在!");
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}
